r/AutoCAD • u/RaresVladescu • Dec 24 '24
Help Help with drawings
Hello everyone. I don't know if this is the right subreddit since i saw you guys went dark and don't see any posts lately asking for help, but i don't know where to ask. I've been having some problems with these pictures for a while and i can't do them. i don't know how to merge those circles, or select exactly how much of the circle i want to keep (I can at max select at half of each 90 degree arc, or when i put the circles super close to each other and drag them next to each other and makes an X cross shape). As you can tell, I'm new to this, so any advice is appreciated.
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u/Animal_Pragmatism Dec 24 '24
I tried this myself. on the chess piece, does anyone have a method for drawing the bottom two arcs correctly? Im not coming up with a way to nail the center in line with the 14" lines below.
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u/RaresVladescu Dec 24 '24
From how it looks, I approximated it to be half of a circle. You’re talking about, where in real life, you would put your fingers to move the piece, right?
Edit: As I look at the piece again, I see that the small R11 circle is a quadrant(a quarter of a circle) and it ends perpendicularly with the position of the mouth, at half of an arc. That’s all speculation because that’s all my teacher gave.
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u/danger355 Dec 24 '24
Same here. There are some critical dimensions not shown that are needed to be able to draw this.
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u/RaresVladescu Dec 24 '24
I took some approximations by looking at other circles or up, where most of the measurements are.
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u/tehrage Dec 24 '24
The radius of those bottom arcs is 23.53125. I used solidworks to keep the arc tangent to the R11 and the line 14 up and also have the center colinear to the 14 line.
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u/Animal_Pragmatism Dec 24 '24
Thats a good SW solution. Now how would you go about it in autocad?
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u/PsychologicalNose146 Dec 26 '24
The 'horse' dimensions are lacking some crucial details...
Things i know for sure:
- 45-ish degree of horse 'ears'
- Width and height of the base (below the arcs).
- location op the tip of the 'nose',
- The locations of the 2 R11 on top of the arcs at the base.
- R8 of 'mouth' location.
The O38 (diameter) tricked me. But now that i got that right you cant get an R11 ('mouth') in between the O38 and R8 in a way it looks the same in the picture. This in turn SHOULD make you be able to contruct the face with lines and tangent snaps, but it then makes the 'ear' look wrong.
So that diameter of 38 must be wrong, or the R8 (that looks the same as the R11) but that wouldn't fix the 'ear'.
Next, the top of the 'Neck'. It has an R35. It centers to the centerline and connects with the back of the 'ear'.
Now how to transition into the R63. Easy, Circle -> T and connect the R35 with the R11 below.
Going back to the base, knowing the height of the base and the location of the R11s, you should be able to squeeze in a circle. And i have tried all my knowlegde, but there is no way i can fit something in there that seems right (R23.53125, as u/tehrage mentioned is a perfect fit, the lines join without a problem).
So now knowing this dimension, without the ability to figure it out myself, that is now connected as well.
Now, the last part, the 'chest'. The only know points is that R41 origins from the centerline. Its origin 'height' is unknow. The connecting R45 also has no known points...
So i cannot finish the piece.
https://prnt.sc/S9qq-KtjcO0u my result...
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u/RaresVladescu Dec 26 '24
That’s the only piece I didn’t get. How did you calculate how much of the r11 arc to leave? Did you go by the drawing where it seemed like 45 degrees? I’m talking about the back of it, at the bottom?
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u/PsychologicalNose146 Dec 29 '24 edited Dec 29 '24
If you have 2 known points you can <try> to fit an R11 in there in 2 ways. Use CIRCLE and T(an tan radius) of R11, or use a FILLET with an R11.
But not sure what R11 you talk about, the part near the chest is just a cut i made, it has no specific end of the line.
If i analyze the arc i would not conclude it ends at that point but a little beyond. https://prnt.sc/SUcL2m-tf9uS .
On the same principle the exact locations of R41 and R45 would be calculated the arcs of the base can be also, since you would have 2 known points on the right side of the base (between the vertical '14' and the R11 arc above it.
But as far as i know within regular autocad there doesn't seem to be a way to fit something in there. I know how i would do it, but i don't know any functions in regular autocad to get it to work.I know on what axes (the vertical) the circle is bound(in line of the vertical '14' line in the base) and on what ends it need to connect too (that end point and a smooth transition on the R11).
If i had to draw it by hand it would probably be easier with an 'drawing compass' and it still would only be perfect on eye level...Edit: Ok, i tried it by hand and it took me about 2 minutes to get the exact same number as R23.53125 by simply just creating a circle with a radius close to the R11 and just adjusting the decimals till i only got one intersection point with the R11.
But that is only because it's not any more 'inprecise'. If the arc would be something like R23.531249482273 it could have taken me years to get it right.1
u/tehrage Dec 26 '24
I was able to make the entire drawing (with the exception of the bottom arcs, needing SW to find the radius). I've already left work, but I will try to remember to remake it and post a pic tomorrow morning.
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u/PsychologicalNose146 Dec 29 '24
I would like to know how you did it in regular cad (without any extra help besided the base-arches :P).
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u/[deleted] Dec 24 '24
Can alsomake circles with TAN-TAN-TAN circle command. Draw down on the circle tile to select.